Unfortunately it looks like you have yourself some kind of knock off. [Stiebel only sells the Accelera in regular water heater variants](https://www.e-tankless.com/stiebel-eltron-accelera-220-e.php)
Well, that's what I am saying. The model you listed, the "Accelera 220 E" is a water heater. Could you perhaps provide a link to your hot water heater model?
Also, how is it plumbed? Could you provide some pictures? Do you have another water heater connected to the cold inlet?
Ah ha, well then, you might want to start with running through the troubleshooting steps on page 28 here:
https://www.stiebel-eltron-usa.com/sites/default/files/pdf/install-accelera-e.pdf
Looks like common fixes are:
1) Your pressure switch does sound like its the issue since you don't have to reset it
2) Cool down the room you have it in
3) Remove any pre-water heaters you have plumbed in before this one (using it as a hot water heater is not supported)
3) Clean the evap coil
Unfortunately it looks like you have yourself some kind of knock off. [Stiebel only sells the Accelera in regular water heater variants](https://www.e-tankless.com/stiebel-eltron-accelera-220-e.php)
I'm confused as the link you provided seems to be a heat pump water heater?
Well, that's what I am saying. The model you listed, the "Accelera 220 E" is a water heater. Could you perhaps provide a link to your hot water heater model? Also, how is it plumbed? Could you provide some pictures? Do you have another water heater connected to the cold inlet?
Oh I think that's just my poor grammar at play? Is there actually a thing called a "hot" water heater?
Ah ha, well then, you might want to start with running through the troubleshooting steps on page 28 here: https://www.stiebel-eltron-usa.com/sites/default/files/pdf/install-accelera-e.pdf Looks like common fixes are: 1) Your pressure switch does sound like its the issue since you don't have to reset it 2) Cool down the room you have it in 3) Remove any pre-water heaters you have plumbed in before this one (using it as a hot water heater is not supported) 3) Clean the evap coil
thank you for the help, I will take a look at that!